Ribonucleoparticle-independent transport of proteins into mammalian microsomes

There are at least two different mechanisms for the transport of secretory proteins into the mammalian endoplasmic reticulum. Both mechanisms depend on the presence of a signal peptide on the respective precursor protein and involve a signal peptide receptor on the cis-side and signal peptidase on the trans-side of the membrane. Furthermore, both mechanisms involve a membrane component with a cytoplasmically exposed sulfhydryl. The decisive feature of the precursor protein with respect to which of the two mechanisms is used is the chain length of the polypeptide. The critical size seems to be around 70 amino acid residues (including the signal peptide). The one mechanism is used by precursor proteins larger than about 70 amino acid residues and involves two cytosolic ribonucleoparticles and their receptors on the microsomal surface. The other one is used by small precursor proteins and relies on the mature part within the precursor molecule and a cytosolic ATPase.

You can listen to Ribonucleoparticle-independent transport of proteins into mammalian microsomes online on Radio and Podcast. Open the player on this page to stream the available audio.

Ribonucleoparticle-independent transport of proteins into mammalian microsomes is an episode from Chemie und Pharmazie - Open Access LMU - Teil 01/02 by Ludwig-Maximilians-Universität München.

This episode is 0 long.

This episode was published on Dec 1, 1990.

Yes. Use the heart button on the episode page to add it to your favorite episodes list.

Yes. This page shows related episodes from Chemie und Pharmazie - Open Access LMU - Teil 01/02 when more episodes are available from the podcast feed.